Those list just a few studies and it looks like they are conflicting? I can't discuss this issue properly because I don't know enough about it.
I would prefer whichever method is both efficient and environmentally-safe. I'm just annoyed by the currently fashionable knee-jerk reaction of people that assume organic farming is better.
More info: http://en.wikipedia.org/wiki/Organic_farming#Productivity_an...
http://www.cnr.berkeley.edu/~agroeco3/modern_agriculture.htm...